品级Grade                               ACS级  
                                     (ACS, ≥97.0%)
外观Appearance                        Black Powder
X-射线衍射分析X-Ray Diffraction       Conforms to Structure
纯度Purity                            ≥97.0 % (Titration by Na2S2O3)
不溶物Insoluble matter                ≤0.2 %
碳复合物Carbon Compounds              ≤0.04 %
氯Chloride                            ≤0.002 %
锰Manganese (Mn)                      ≤5 ppm
硝酸根Nitrate (NO3)                   ≤0.02 %
硫酸根Sulfate (SO4)                   ≤0.05 %
钠Sodium (Na)                         ≤0.1 %
钾Potassium (K)                       ≤0.05 %
钙Calcium (Ca)                        ≤0.02 %
铜Copper (Cu)                         ≤0.05 %